Analog Devices LTC3865 Product Info

• Dual, 180° Phased Controllers
• 2-Pin VID Output Voltage Programming from 0.6V to 5V
• High Efficiency: Up to 95%
• R_SENSE or DCR Current Sensing
• Phase-Lockable Fixed Frequency 250kHz to 770kHz
• Adjustable Current Limit
• Dual N-Channel MOSFET Synchronous Drive
• Wide V_IN Range: 4.5V to 38V Operation
• Adjustable Soft-Start Current Ramping or Tracking
• Output OV Protection With Reverse Current Limit
• Power Good Output Voltage Monitor
• 32-Pin 5mm × 5mm QFN and 38-Lead TSSOP Packages

The LTC3865/LTC3865-1 are high performance dual synchronous step-down DC/DC switching regulator controllers that drive all N-channel synchronous power MOSFET stages. A constant frequency current mode architecture allows a phase-lockable frequency of up to 770kHz. Power loss and noise are minimized by operating the two controller output stages out of phase.

OPTI-LOOP^® compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. Independent track/soft-start pins for each controller ramp the output voltage during start-up. Current foldback limits MOSFET heat dissipation during short-circuit conditions. The MODE/PLLIN pin selects among Burst Mode^® operation, pulse-skipping mode, and continuous inductor current mode. The output voltages can be precisely programmed by pin strapping or external resistors.

The LTC3865/LTC3865-1 are available in low profile (5mm × 5mm) 32-pin QFN and 38-Lead thermally enhanced TSSOP packages.

Applications

• DC Power Distribution Systems